Projectile



` -Oct.'8, 1940, I P. R. DE wlLDE ETA.

. PROJECTILE Filed NOV. 25, 1938 i sopwhiche isrpiacew a harm boays'intended' to causer .:4gInfcaseofanizexplosive projectile; all oithemetalhl v fliclshellisftormevenxpulverizediby theffblowing f Y V rnomc'mn i 'rmi-runen@ wuasana cmmir Kaufmann, Y Y Geneva. Switzerland )Application-.Noventa z5, 1938. serial No. mais Iir'Switlei'iam November 30, 1937 'lofclsim (ci: 1oz-ao) iireforffby-Llarge f perforationst.

.whueffswzn resuitsfarenowpraeticauyfatwnedf mfilby? special mediuml bore-projectiles of.l 20 f mm.' .ors

' wvF'diary projectiles: it'willjzber sumcientj tp, remember the f1 -phosphoroiiaVv ones and'f-thel tracing `bullets which, from:specialists` unanimous opinions; give -sonly precariousionirregularfresults'.

. VI'l'iei present. invention` refers to a small' size 4v'3205.-'.projectilehavingy incendiary orf'eizpljoesive` proper-v '-'-tf'es:-ior;use1:withzcurrent=z military-rifles; orjquick `fi'i`rlngf:guns. ,#.Outwardlyjgthis proiectilegfcannot `be' distin- "guishedainvanyfwayg iromian ordlnary'bulletior i riile;

' ".HoweverpinstcadroibeingI azsolidmetaibullet,

" f 'itisihallowedthroughout'fitsdength. The-hollow l' y the small bore armas an ordinaryY solid bullet.

The composition c cannot-be-ignited or4 exploded 80 r *when the shot is ilred, because experiences have proved that iirst the propulsion actionfof the",

gpartiz'cont'ains: first: ai fulminant charge orl load in 1.th`e. inflammation: of|` the charge,A .l whenr impact occurs; and nexti: a, charge oi'l vpyroteclinical or -.:.explosivefzcompositlon. "The: projectile is sealed ifbyf aplugilwhichforfan inceni'iiaryi projectile Vis imV expelled/.f byy the internal v. pressure causedizby` -the I 1: 'desgration` ofLthell charges; thus letting: out voi' 7 fibel-'projectiles'.aasiiicientfqnantity of:v incandes-V :cent1 matter.: capable 'fofffsettins-re torfanyV combustible:` materiali surrounding the impact point.

. up."v ,oifftl'recl internals explosive.v charge:

yThe'o'n1y.f.ii'8iire: of-utheiannexedjdrawing shows asfam example. a@ longitudinalr'isectionalviewfof 'a 451;: .proiectllerjaccording to'. present linvention;

y This=.-"'pro;leotilel ishollowedr throushmit lits -length. VThishallowedfoutfportion maybea bore :of equal l diameterforott diirerent diameters-ac- ,cordingzi toranyi desired".design.:l In ther drawingVv f .foirjthe i'lorwardj nose portion=is=shown1toihavea :smaller-diameter r than'thevreurv portion. 'In the.

lhollow.: pointed laroh' or'v ogivey. is lodgedraY relatively vheavily compressed i'ulmiriant priming charge a...

w :Right 1in`1theacentree` of?. the: iul'rninantpriming.v

iingin'ternal pressure happening within the body` charge is placed a hardbody byfor instancenmade of metal, and which-'is i'ree from the -iiisidewalls ot the z bullet, and havingv Vnofcontactwhatever` Y withsaidwalls.

.Following the priming Iuhninant charge isa d sneu of the bauetwmchgcan'bese; orrprced, c. rinto the bevel vof the shell of'theprojectile'.V In 20VV case o! an incendiary bullet, the plug d' is xed to the shell of the bullet in such a way that it can be expelled far away by the suddenly growofthe bullet. c v c y,

The" working ofthe thus described projectile is as follows:

4`Whenvit 1s-nrea,it'wmes'out ofthe barrel f gases of the cartridge powder-'is progressive and does'not give a sumcient impact to bring ythe A fuhninant charge a to detona'tiorl.'v The sensitiv- 85 ity of the fulminate powderis controlled'by'the hardness of pack (pressure in loading). and it isV very easilypacked so that itwill not explode at set back while 'the sensitivityis'readilytesily A and accurately controlled by regulating the paclzl0 ingy pressure. Also there is no heat caused by l iiictioriL between pointed arch oi' the shell ot the bullet and inside of the arm barrel, since therel is no contacter-these Y When, on its trajectory, the projectile-hits an u obstacle otl'ering resistance to'its'progress. as for instancethe metal sides oi'a tank, an airplane,

wing, an armoredV plate,` etc. the'percussion due .to the .inertiaot the hard body lodged in the nical qualities, meaning that the projectile is in H i cendiary, the instantaneous internal pressure generated from gases within the bullet expels the plug d backward, thus opening the base of the bullet through which incandescent metallic particles or other incendiary material can be forcibly expelled.

However account must. be taken that during the very short duration of the phenomenon, all the mass of the bullet itself and its content, lgnited matter, etc., owing ,to acquired velocity of projectile and inertia, keeps on moving from rear to front of projectile and at same velocity that projectile itself which is, as well known, of hundreds of feet per second.

The two motions, be itthe forward one, proper to the projectile or the backward one, proper to the gases and incandescent 'particles emitted from the bullet after percussion, have a tendency to neutralize, since they are contrary.

Provided a sumcient rapidity of the deflagra tion of pyrotechnical matter contained in the bullet occurs, the result of the two motions is an emission, at the bullet percussion point or immediately surrounding it, of gases and incandescent metallic particles, which in tum regularly ignite the surrounding mixture of air and fuel escaping from tanks or pipes stricken by the projectile.

If the composition c is an explosive one, the projectile bursting occurs in a verysmall fraction of a second, after the impact of the projectile against an obstacle, an airplane wing for instance.

'I'he different shattered parts of the projectile, keeping their component motion, in the same Vdirection as the projectile trajectory, nearly all receive at the explosion time a compounded motion perpendicular to the projectile trajectory. 'Ihese two components add their effects, with the results that the projectile parts are showered at the stricken obstacle, in a slanting way from the original trajectory, and owing to this fact astonishing destructive effects are obtained.

Owing 'to the ratio between the mechanical resistance of the projectile shell and the potential of the explosive composition, the results obtained with this projectile can be quite different; it can be designed or manufactured to cover special definite aims.

The thickness of the walls, the proiile of the nose portion or ogive of the ball, the diameter of the solid metal body located within the nose portion, and the more or less important compression of the fulminant charge regulate the sensitivity of the ball in a perfectmanner. Due to these arrangements a. very high degree of security may be attained by use of the ball according to the invention, premature explosion on ilring will be precluded while regularand precise actuation upon an obstacle offering a certain resistance will be insured.

What we claim is:

1. A projectile comprising a shell having a longitudinally disposed bore, vdetonating material in the forward end of said bore, anexplosive charge adjacent said detonating material in the rear portion of said bore and a substantially spherical metal body embedded in'said detonating material and completely surrounded therewith, whereby when said projectile strikes an object the substantially spherical metal body will ignite the said fulminate and explosive chargs.

2. A projectile -comprising a shell having a longitudinally disposed bore, detonating material in the forward end of said bore, an incendiary charge adjacent said detonating material in the rear portion of said bore and a substantially spherical metal body embedded inlsaid detonating material and completely surrounded therewith,

whereby when said projectile strikes an object the substantially spherical metal body will ignite the said fulminate and incendiary charges.

3. A projectile comprising a shell having a longitudinally disposed bore, detonating material in the forward end of said bore, an explosive charge adjacent said detonating -`material, an incendiary charge adjacent said explosive charge and a substantially spherical metal body embedded in said detonating material and completely surrounded therewith, `whereby when said pletely surrounded therewith, whereby when said projectile strikes an object the substantially -spherical metal body will ignite the said charges.

5. A projectile as claimed in claim 1, where said substantially spherical. metal body is a steel ball.

6. A projectile as claimed in claim 2, wherein aicli substantially spherical metal body is a steel 7. A projectile as claimed ln claim 3, wherein isaaid substantially spherical metal body is a'steel il. A projectile comprising a shell having a pointed nose portion and a blunt end portion, a bore longitudinally disposed in said shell, the forward end portion of said bore in the nose portion of said shell having a smaller diameter than the major rear portion o f said bore, detonating material packed within said small diameter of said bore, an explosive charge packed within the rear portion of said bore, a solid substantially spherical steel ball embedded in and entirely surrounded by said detonating material.

9. A projectile comprising a shell having a pointed nose portion and a blunt end portion, a bore longitudinally disposed in said shell, the

lforward end portion of said bore in the nose ward end portion of said bore in the nose portion of said shell having a smaller diameter than the -bore and a solid-substantially spherical steel ball embedded in and entirely surrounded by said detonating material.

PAUL REN De WILDE. CASIMIR KAUFMANN. 

